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Circuit for Sensing Threshold Voltage and Display Device Including the Same

a display device and threshold voltage technology, applied in the direction of instruments, static indicating devices, etc., can solve problems such as changing threshold voltages, and achieve the effect of reducing offsets and improving reliability and sensitivity

Active Publication Date: 2018-07-05
DONGBU HITEK CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a circuit that can sense a threshold voltage without being affected by unwanted electrical properties, and can improve the reliability and sensitivity of sensing the threshold voltage of an organic light emitting diode (OLED). This invention is useful for producing a display device that can operate more efficiently and accurately.

Problems solved by technology

The OLEDs of the display panel may gradually deteriorate with the passage of time, thereby changing threshold voltages.

Method used

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  • Circuit for Sensing Threshold Voltage and Display Device Including the Same
  • Circuit for Sensing Threshold Voltage and Display Device Including the Same
  • Circuit for Sensing Threshold Voltage and Display Device Including the Same

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Embodiment Construction

[0058]Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0059]In description of the embodiments, it will be understood that, when an element such as a layer (film), region, pattern or structure is referred to as being formed “on” or “under” another element, such as a substrate, layer (film), region, pad or pattern, it can be directly “on” or “under” the other element or be indirectly “on” or “under” the other element with intervening elements therebetween. It will also be understood that “on” and “under” the element is described relative to the drawings.

[0060]In addition, the relative terms “first” and “second”, “top / upper / above”, “bottom / lower / under” and the like in the description and claims may be used to distinguish between any one substance or element and other substances or elements and not necessarily for describing any physical or logical relationship between the substances or elements or a particular order. In ad...

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Abstract

A circuit configured to sense a threshold voltage of an organic light emitting diode (OLED) of a display panel includes a sample and hold unit configured to receive the threshold voltage of the OLED, a first sampling capacitor between the first input terminal and a first reference voltage, and a first charge sharing capacitor having a first terminal connected to the first sampling capacitor and a second terminal connected to a second reference voltage, a second sample and hold unit including a second input terminal connected to the first reference voltage, a second sampling capacitor between the second input terminal and the first reference voltage, and a second charge sharing capacitor having a first terminal connected to the second sampling capacitor and a second terminal connected to a third reference voltage, and an amplifier including first and second amplifier input terminals connected to the first and second output terminals, respectively.

Description

[0001]This application claims the benefit of Korean Patent Application No. 10-2016-0183721, filed on Dec. 30, 2016, and may be related to U.S. patent application Ser. No. 15 / 620,580, filed on Jun. 12, 2017 (Attorney Docket No. OPP-GZ-2017-0003-US-00), which are hereby incorporated by reference as if fully set forth herein.BACKGROUND OF THE INVENTIONField of the Invention[0002]Embodiments of the present invention relate to a circuit configured to sense a threshold voltage and a display device including the same.Discussion of the Related Art[0003]Pixels of a display device using organic light emitting diodes (OLEDs) are turned on by data signals supplied from data lines to generate light when the data signals are supplied to gate lines of the OLEDs.[0004]OLEDs having unique colors (e.g., red, green and blue) may form a unit pixel of a display panel, and a desired color may be implemented by a combination of the colors of the unit pixels.[0005]The OLEDs of the display panel may gradual...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G09G3/3266
CPCG09G3/3266G09G2330/12G09G2320/045G09G2310/0294G09G2310/0291G09G2310/0297G09G3/3291G09G2300/0819G09G3/3233G09G2300/0828G09G2300/0842
Inventor HWANG, TAE HO
Owner DONGBU HITEK CO LTD